I applied through a recruiter. The process took 3 months. I interviewed at MongoDB
Interview
Phone Screen with a recruiter
Karat Technical Interview (2 LC (easy->medium) Questions + Time Complexity analysis]
Final Round (heard back day after, they move pretty fast)
- 45 Minute OOP Programming
- 45 Minute Leetcode Problem (Easy-Medium)
-45 Minute Behavorial
Offer after 2 weeks
Interview questions [1]
Question 1
Merge Binary Trees Leetcode Problem, some array stuff for the Karat
Not bad, there were four technical interview rounds where each round they asked a question regarding coding and explaining my answer. But it was mostly just coding and algorithm and system design questions.
I applied through college or university. I interviewed at MongoDB (Gurgaon, Haryana) in Jan 2026
Interview
Total 5 rounds highly tiring. First round is phone screen followed by a karat technical round(DSA + CS fundamentals). Then 2 technical rounds about projects, previous experience + more DSA. Finally last HR round.
Interview questions [1]
Question 1
What do you know about MongoDB and its culture ? What do u understand by SQL and No-SQL database and which is beneficial in which case.
I applied online. I interviewed at MongoDB (Dublin, Dublin)
Interview
Recruiter reached out after seeing my CV, and scheduled an initial call. Later got interviewed with Karat which asked leetcode easy/medium questions, which I didn't do so well on due to pressure.
